how to fix P0420 code on Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down if it has been running.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Instructions:
  1. Locate the upstream and downstream oxygen sensors on the exhaust system.
  2. Disconnect the electrical connectors from both sensors.
  3. Use the O2 sensor socket to remove the sensors from the exhaust pipes.
  4. Install the new sensors, ensuring they are tightened to the manufacturer's specifications (usually around 30 ft-lbs).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter, torque wrench.
• Instructions:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Remove any heat shields that may obstruct access to the catalytic converter.
  3. Use the exhaust pipe cutter to remove the old catalytic converter from the exhaust system.
  4. Install the new catalytic converter and ensure all bolts are tightened to the specified torque (generally around 30-35 ft-lbs).
  5. Reattach any heat shields previously removed.

4. Clear Codes and Test Drive

• Tools Required: OBD-II scanner.
• Instructions:
  1. Reconnect the negative battery terminal.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
  3. Start the engine and allow it to reach normal operating temperature.
  4. Take the vehicle for a test drive to verify that the check engine light does not reappear and that the vehicle runs smoothly.